Problema con indirizzo pcf8574p

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ciao tutti,

ho un problema con due pcf8574p, usando l'i2c scanner (quello compatibile con il mega indicato nel playground), tenendo a0, a1 e a2 oscillanti, arduino lo vede. l'indirizzo ovviamente cambia: 0x23 e 0x27.

se collego questi tre pin massa e/o 5v per modificarne e stabilizzarne il valore, l'i2c scanner si blocca. e comunque mi sembra che il pcf non funzioni.

se ho capito bene hai un arduino mega
dove hai collegato il pcf? sui pin scl e sda o a4,a5 o 20-21?

ciao uwe


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